auxprogs/ltp-tester.sh: Fix typo in summary log grep

auxprogs/ltp-tester.sh: Fix typo in summary log grep

This does point out a couple more failures. In case the test results
differ when running under valgrind, but there are no other error
indicators. e.g. openat202 now reports:

openat202: diff -u log1summary log2summary:
--- log1summary
+++ log2summary
@@ -1,5 +1,5 @@
-passed   9
-failed   0
+passed   8
+failed   1
 broken   0
 skipped  0
 warnings 0

Which points out we have a bug in our openat wrapper when given
/proc/self/exe with RESOLVE_NO_MAGICLINKS (which should fail with
ELOOP, but succeeds when running under valgrind, probably because we
have a "magic" /proc/self/exe wrapper).